JPS5846396Y2 - Composite refractory for industrial furnace lining - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a composite refractory used for lining the furnace walls of industrial furnaces such as soaking furnaces.

Conventionally, in order to prevent heat loss within the furnace, the inner wall surface of the furnace is lined with ceramic fiber felt having excellent heat insulation properties, as shown in FIG. 1 or 2.

That is, to explain the construction method using a diagram, first, stud pins 2 with one end threaded are erected by welding at intervals of 20 to 30 cm on the iron skin casing 1 of the furnace, and the stud pins 2 are wound in a roll shape. A long rock wool felt 3 is inserted and temporarily fixed while being stretched, and a long ceramic fiber felt 4 wound into a roll on top of the rock wool felt 3 is further inserted into the stud pin 2 and stacked.

Next, insert a washer 5 into the tip of the stud pin 2 from inside the furnace, or insert a washer 5 and a ceramic stopper 7 as shown in FIG. 1-3 and ceramic fiber felt 4 are lined.

However, in each of the above lining structures, the heat-resistant steel parts (stud pins, washers, nuts) are exposed inside the furnace and exposed to high temperatures, so they deteriorate due to oxidation in a short period of time, and the fixation of ceramic fiber felt etc. deteriorates. There are problems such as the amount of heat in the furnace being transferred to the shell casing through the stud pins, resulting in heat loss.

In addition, in the above-mentioned lining construction, there is a problem in that if multiple layers of long felt are stacked, the number of insertions into the stud pins increases, making the work complicated.

The present invention was made to eliminate the above-mentioned drawbacks, and provides a composite refractory for industrial furnace lining that can significantly simplify the construction of lining and can be stably lined with iron shell casings for a long period of time. This is what I am trying to do.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 3 and 4.

In the figure, 11 is a ceramic fiber block.
This block 11 is made by laminating, for example, ten alumina-siliceous fiber felts 12...12, and one side surface 13 formed by the end face of each felt 1 to 12...12. There are two grooves 14.1 with a key-shaped cross section.
4 is formed along the stacking direction.

A monolithic refractory block 15 is integrally fixed to one side surface 13 of this block 11 via the groove 14. A wire mesh 16 is embedded as a reinforcing plate.

Further, a stud bolt 18 serving as a fixing fitting is integrally planted on one side 13 of the fireproof block 15 and the opposite side 17 thereof.

Note that the composite refractory for lining of the present invention has a ceramic fiber block 1 in a frame 19 as shown in FIG. 5, for example.
1 on one side 1 of the block 11 having the groove 14.14.
After that, the monolithic refractory is poured from the container 20 into the frame 19, and the wire mesh 16 is poured in the middle.
Then pour the monolithic refractory up to the upper surface of the frame mold 19, and before the monolithic refractory hardens, insert the stud bolt 1.
8 into the refractory to a predetermined position and sufficiently harden it.

According to such a configuration, as shown in FIG. 6, the stud bolts 18 on the monolithic refractory block 15 side of a plurality of composite refractories are inserted into the through holes of the steel shell casing 21,
The composite refractory is fixed to the steel shell casing 21 by threading the nut 22 onto the tip of the protruding stud bolt 18.

Therefore, the composite refractory can be lined with an extremely simple construction method without stretching a roll of ceramic fiber felt or stacking many layers of felt as in the past.

In addition, the composite refractory of the present invention includes a ceramic fiber block 11 made of a laminate of felts 12 made of ceramic fibers, and a monolithic refractory block 1.
5 is a groove 14 formed in the fiber block 11.
．． Since the fiber block 11 located inside the furnace does not fall off due to hot air or other vibrations, it can exhibit an excellent heat insulation effect for a long period of time because it is fixed integrally and firmly by the anchoring effect of the monolithic refractory that has flowed into the furnace. .

Furthermore, the stud bolts 18 of the composite refractory are embedded in the monolithic refractory block 15 that abuts the steel shell casing 21, and are not exposed inside the furnace at all. In addition to being able to stably support the composite refractories, the heat inside the furnace can be transferred to the stud bolts 18.
It is possible to prevent the heat from being transmitted to the iron shell casing 21 through the heat sink, thereby improving heat loss.

In addition, a wire mesh 16 is buried inside the monolithic fireproof block 15 (
If the block 15 is built in), it is possible to prevent crack pieces from falling off when the block 15 cracks.

In addition, when lining the composite refractory in the steel shell casing 21, if the lining is done so that the stacking directions of the ceramic fiber felt blocks of adjacent composite refractories follow each other, as shown in Figure 6, it is possible to Damage to ceramic fiber blocks caused by hot air generated inside can be reduced.

In addition, the material and number of ceramic fiber felts constituting the ceramic fiber block of the composite refractory in the present invention are not limited to the above examples, and may be made of rock wool, siliconia-alumina-silica, etc. The number of sheets may be any number such as 6, 8, 11 or more.

The number and shape of the grooves formed in the ceramic fiber block of the composite refractory in the present invention are not limited to the above embodiments, and the number may be one or three or more, and the shape may be approximately circular in cross section. etc., and may be made discontinuous if necessary.

In this case, the grooves may be impregnated with colloidal silica in order to increase the strength of the grooves and improve the anchoring effect.

The reinforcing plate built into the monolithic refractory block of the composite refractory according to the present invention is not limited to the wire mesh as in the above embodiment, but a punched plate or the like may be used.

The fixing fittings to be inserted into the monolithic refractory blocks of composite refractories in the present invention are not limited to the stud bolts as in the above embodiments, but may also be, for example, connection pipes threaded on the inside, or other composite refractories. When lining the ceiling, a stud with a loop-shaped or T-shaped tip may be used as the fixing fitting.

As detailed above, according to the present invention, it is possible to significantly simplify the lining construction work, prevent oxidation deterioration of the fixing metal fittings, and stably line the steel shell casing for a long period of time. It is possible to provide a composite refractory for lining industrial furnaces that can exhibit a heat insulating effect.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views of a conventional furnace lined with ceramic fiber felt, Figure 3 is a perspective view of a composite refractory for industrial furnace lining showing an embodiment of the present invention, and Figure 4. is the third
Fig. 5 is a perspective view showing the manufacturing procedure of the composite refractory of the present invention, and Fig. 6 is a sectional view showing the furnace wall structure lined with the composite refractory of the present invention. . 11...Ceramic fiber block, 14
゜14... Groove, 15... Monolithic fireproof block, 18... Bent stud bolt, 21...
・Iron shell casing.

Claims (1)

[Scope of utility model registration request] A ceramic fiber block consisting of a laminate of multiple pieces of ceramic fiber felt and having a groove along the lamination direction on one side formed by the end face of each felt, and a monolithic refractory integrally fixed to one side of the block. A composite refractory for lining an industrial furnace, comprising a block and a fixing fitting inserted into the refractory block.